Molding-machine.



No. 812,820. PATENTED PEB. 20, 1906. C. J. GALBY.

MOLDING MACHINE.

APPLICATION FILED MAR.24. 1905.

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' IINITED -'STATES PATENT FFTCE,

CHARLES J. CALEY, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR 'IO THE RUSSELL 8a ERVIN MANUFACTURING COMPANY, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

HOLDING-MACHINE.

Specification of Letters Patent.

Application filed March 24, 1905. Serial N0. 251,922-

iro machine for holding the parts of a iiask, compacting the sand, and separating the parts so as to form a perfect and uniform mold.

My invention is particularly adapted to what is known as the oscillating-yoke type 15 of machine, in which a stationary table supports a flask and an oscillating yoke or rammer compresses the sand. In such machines difliculty is often encountered in their operation by reason of vibration, which re- 2o sults in uneven molds and consequent irregular products.

Besides the mechanism for oscillating the rammer I have provided coperating guide members, which are broughtl into play just z as the rammer is in its operating position.

The principles of the invention are illustrated in the accompanying single sheet of drawings.

Figure 1 is a front elevation of a machine 3o embodying the improvements of my invention. Fig. 2 is a side elevation of the same. Fig. 3 is a detail sectional view of the operating cylinder and piston.

1 is the main frame or standard of the ma- 3 5 chine.

2 is the table or support on which the flask is rested.

3 is the rammer, carried by the arms 4 4, forming a yoke.

5 5 are blocks, to which the lower ends of the arms 4 4 are attached. 6 6 6 6 are rollers, which are carried by these blocks and guided in slots in opposite sides of the machine, as slot 7. These slots are vertical 45 through part of their extent and then curved backwardly, so that the rammer yoke is guided in its movement, being backwardly inclined when in its upper retracted position and being vertical when in its lower operat- 50 ing position. There is, however, at all times more or less play in order that the parts may work freely. To assist in keeping the two arms of the yoke and the two 'sets of rollers in alinement, the two blocks 5 5 are connected by a rod or shaft 8 at the rear,

9 is a central shaft located below the table, which is capable of a partial rotation. 10 10 are arms secured to said shaft and connected by the rods 11 11 to the arms 4 4 on a line with the centers of the upper rollers 6 6.

12 is a spring which through the medium of its head 13 and the arm 14 tends to rotate the shaft 9, and thus hold the yoke in the backward retracted position, as shown.

15 is a cylinder longitudinally movable relative to the piston-rod 16, which is pivoted on the shaft 17.

18 is an arm projecting from the shaft 9 and connected to the head of the cylinder 15. This cylinder may be operated, for instance, by compressed air, pressure within the cylinder tending to rotate the shaft in a clockwise direction, as viewed in Fig. 2, and thus force the yoke downward. As the yoke is moved downward the two pairs of rollers operating in the slots 7 are guided so as to bring the rammer 3 directly over the table. The momentum of the parts, however, is such that the arms 4 4 sometimes continue to vibrate slightly even after the rollers 6 6 are in the vertical part of the slot 7, so as to jar the iiask and cause irregular work.

20 20 are stationary projections carried adjacent to the arms 4 4.

21 21 are curved guideways in the arms 4 4, arranged so that as the arms'are drawn downward and forward the entrance to the guideways will come immediately to the rear of the projections 20 20, and as the arms are further moved downward in a straight line the straight portions of the guideways are brought into coperation with the projections, so as to cause the arms to move the IOO mer, a pivoted shaft, an arm-and-link connection from said shaft to said side arms, a curved guide, means carried by the lower end of said side `arms for coperating with said guide, means for operating said side arms,

and means comprising coperating projecting and grooved parts for holding and guiding the upper portions of said side arms in a straight line without vibration when said side arms are brought into a Vertical position.

2. In a molding-machine, an oscillating yoke, means for moving it downward and forward, an interlocking rectilinear guide for said yoke consisting of a projecting male and an open-ended female part, one stationary and the other carried by the oscillating yoke, by which the yoke is guided rigidly during the effective part of its operating stroke.

3.V In a molding-machine, the combination of a frame, a table, a pair of curved guides carried by said frame, a yoke, rollers carried by the lower ends of the arms thereof, coperating with said guides, means for operating said yoke, and an interlocking rectilinear guide for said yoke comprising a projecting member and a grooved part adjacent the central portion of said yoke and brought into operation to prevent vibration during the effective portion of the ramming stroke.

4. In a molding-machine, a stationary frame, projections at the opposite sides thereof, an oscillating yoke, means for operating the same, the arms of said yoke having guideways 21 opening laterally for coperating rih said projections for the purpose speci- 5. In a molding-machine of the oscillatingyoke type, an interlocking rectilinear guide consisting of a projecting male and an openended female part, the one on the oscillating yoke, the other on the stationary or non-oscillating part of the machine, by which the ramming-yoke is guided rigidly during ramming.

CHAS. J. CALEY. Witnesses:

M. S. WIARD, F. E. SUNBURN. 

